In a cast iron skillet over medium high heat, toast the chilies until aromatic, about 20 seconds per side. Add to a bowl with 1 oz of water to help soften them
Toast the garlic in its skin until softened and browned.
Toast spices and Hoja Santa leaves then add to chilies.
Toast spices, plantain, cashews, prunes, raisins and tomatoes. Allow tomatoes to slightly blackened. Reserve.
Toast sesame seeds until deep brown. Reserve
Mash spices in mortar. Once ground add chilies and Hoja Santa leaves, then mash to a paste.
Add 3 Tablespoons diced onions, herbs, cashews, and plantain. Mash until combined.
Add toasted tomatoes, garlic, raisins, and prunes.
Once combined into a paste begin to cook on stove top for 15-20 minutes. Stir constantly to prevent burning, adding water if necessary to prevent drying out.
While still hot, stir in the chocolate until melted and reserve. Season with salt to taste.